Doesn't work. First I get fatal error in step 1, then step 2, then step 3. Fatal error= line 479 image cleaner plugin.php. I only have 701 images. Not the end of the universe here.
Argh...had to reboot mysql when I tried to delete. Created a 2.57 mb of error reporting in my error log. Scary.
All I can say is, Gone, Gone, Forever Gone!